Sofa



FIG. 1 is a front perspective view of a seat showing our new design in the form of a sofa;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a left side view thereof, the right side view being a mirror image; and,

FIG. 5 is a rear perspective view thereof.

The broken lines shown on the seat cushion are understood to represent stitching. 

The ornamental design for a sofa, as shown and described. 